17921958045 has 16 divisors (see below), whose sum is σ = 28943127360. Its totient is φ = 9469046144.

The previous prime is 17921958023. The next prime is 17921958071. The reversal of 17921958045 is 54085912971.

It is a cyclic number.

It is not a de Polignac number, because 17921958045 - 2⁵ = 17921958013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5581560 + ... + 5584769.

It is an arithmetic number, because the mean of its divisors is an integer number (1808945460).

Almost surely, 2^17921958045 is an apocalyptic number.

17921958045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17921958045 is a deficient number, since it is larger than the sum of its proper divisors (11021169315).

17921958045 is a wasteful number, since it uses less digits than its factorization.

17921958045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11166444.

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 17921958045 in words is "seventeen billion, nine hundred twenty-one million, nine hundred fifty-eight thousand, forty-five".